参数资料
型号: PIC16C621-20/SS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDSO20
封装: 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件页数: 57/121页
文件大小: 1202K
代理商: PIC16C621-20/SS
PIC16C62X
DS30235H-page 40
1999 Microchip Technology Inc.
7.4
Comparator Response Time
Response time is the minimum time, after selecting a
new reference voltage or input source, before the
comparator output has a valid level. If the internal refer-
ence is changed, the maximum delay of the internal
voltage reference must be considered when using the
comparator outputs. Otherwise the maximum delay of
the comparators should be used (Table 12-2 ).
7.5
Comparator Outputs
The comparator outputs are read through the CMCON
register. These bits are read only. The comparator
outputs may also be directly output to the RA3 and RA4
I/O pins. When the CM<2:0> = 110, multiplexors in the
output path of the RA3 and RA4 pins will switch and the
output of each pin will be the unsynchronized output of
the comparator. The uncertainty of each of the
comparators is related to the input offset voltage and
the
response
time
given
in
the
specifications.
Figure 7-3 shows the comparator output block diagram.
The TRISA bits will still function as an output
enable/disable for the RA3 and RA4 pins while in this
mode.
Note 1: When reading the PORT register, all pins
configured as analog inputs will read as
a ‘0’. Pins configured as digital inputs will
convert an analog input according to the
Schmitt Trigger input specification.
Note 2: Analog levels on any pin that is defined
as a digital input may cause the input
buffer to consume more current than is
specified.
FIGURE 7-3:
COMPARATOR OUTPUT BLOCK DIAGRAM
D
Q
EN
To RA3 or
RA4 Pin
Bus
Data
RD CMCON
Set
MULTIPLEX
CMIF
Bit
-
+
D
Q
EN
CL
Port Pins
RD CMCON
NRESET
From
Other
Comparator
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